Include Dockerfile for packer validate action.

It uses Hashicorp packer base Docker image version v1.3.5

Author: dawitnida

Diff for: .gitignore

@@ -0,0 +1,9 @@
+### Packer template
+# Cache objects
+packer_cache/
+
+# For built boxes
+*.box
+
+.idea/*
+

Diff for: Dockerfile

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+FROM hashicorp/packer:1.3.5
+
+LABEL "com.github.actions.name" = "packer-validate"
+LABEL "com.github.actions.description" = "Validate packer template file in a directory"
+LABEL "com.github.actions.icon" = "alert-circle"
+LABEL "com.github.actions.color" = "orange"
+
+LABEL "repository" = "https://github.com/dawitnida/packer-github-actions"
+LABEL "homepage" = "https://github.com/dawitnida/packer-github-actions"
+LABEL "maintainer" = "Dawit Nida <[email protected]>"
+
+RUN apk --no-cache add jq
+
+COPY entrypoint.sh /entrypoint.sh
+RUN chmod +x /entrypoint.sh
+ENTRYPOINT ["/entrypoint.sh"]